Jonathan Singleton Called Up By Houston Astros

The Houston Astros have added baseball's top 1B prospect, Jon Singleton, to their MLB roster. Singleton ranked 4th in our Top AAA Hitters rankings through May, and joins fellow superstar prospect George Springer
in Houston. The Astros have also signed Singleton to a 5 year deal, the 1st time in Major League history that a player got a contract extension before playing a single game in the Bigs.

Baseball America ranked Singleton as the 57th best prospect in baseball before the season, saying he "has middle-of-the-order potential" in their 2014 Prospect Handbook. The Astros acquired the first baseman from the Phillies in the Hunter Pence trade a few years ago.- CBS Sports